Loader for concrete-mixers



E. H. LICHTENBERG.

LOADER FOR CONCRETE MIXERS.

APPLICATION FILED MAILzs, 191e.

Patented Aug. 16; 1921.

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LOADER FOR CONCRETE NIIXERS; APPLICATION man MAR.28. 191.'

Patented Aug. 16, 1921.

2 SHEETS-SHEET 2.

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ERICH kH. LIOHTENBRG," OF MIL'WAUKEE, WISCONSIN, ASSIGNOR, BY MESNE .ASSIGN- kllllENTS, TO KOEHRING COMPANY, OF MILWAUKEE, WISCONSIN, A. CORPORATION orA wiscoivsriv.

Specification of Letters Patent. Patelltd Allg.

LOADER FOR CONCRETE-MIXERS.

Application filed March 28, 1918. Serial No. 225,255. Y

To all lwhom t may con ccm Be it known that I, ERICH H. LicirrnN- BERG, a citizen of the United States, residing at Milwaukee, in` the county of. Milwaukee and State of Visconsin, have invented certain new and useful Improvements in Loadersv for Concrete-Mixers, of which the following is a specification. y

The present invention has relation to the art of loading devices and comprises an improved type ofV loader in the form of a s kip and its operating means adapted particularly foi1 facilitating the loading of concrete aggregates into concrete mixing machines. The loading means ofthe invention may, however, be utilized for other purposes than in connection with .concretemixera as will be obvious on reference tothe detailed eX- planation of the operating means.

The essential novelty of the'invention resides in the` provision of operating means for a loading skip including peculiar driving operating connections forV raising the skip., whereby the driving mechanism or power plant employedmay be utilized with the highest degree of eliiciency. .The driving connectionsk allow for application/of the driving forces in elevating the skip in such a manner that during the period of elevation when the load is greatest the driving forces are applied with maximum power with resultant slow speed of movement of the load, while duringa llater period of elevation when the resistance of the load is decreasin owing to the peculiar mounting of the skip the said driving forces operate with rcducedpower but increased speed in bringing the load to the point of elevation at which it is unloaded theskip. i :V c Y I I am enabled to utilize the variable speed and the applicationof variable forces inelevating the skip and itsload according to my invention by taking advantage ofthe method of supporting the skip, the principle of leverage obtainable by recourse to pulleys and cone shaped winding drums. being employed in accomplishing the desired end. f

Another feature of the present improvements involves safety provisions as a part of the hoisting mechanism whereby in the event of breakage of the hoisting cable or cables a clutch pulley or pulleys become eifective to prevent accidental dropping of or discharged from the load comprisingtheskip alone or the skip and its contents.V

These and such other objectsas mayk here- 'i inafter,` appearY are attained bythe novel construction, combination and arrangement of parts to be hereinafter specifically ,described and claimed. Referencev will now be had to the accompanying drawings forming a part of this specification, wherein Figure 1 is a side view showing somewhat diagrammatically the lsupporting framework'and power plant of a concrete mixer in connection with which my loading de-y Y vice is illustrated, full linesy showing the loading skip in its load receiving position, and dotted lines showing said skip in its uppermost ork discharging position;

Fig. 2 isa similar somewhat diagrammatic top plan view of the machine; and

F ig. 3 is ay detail view showing more fully the formation of the snatch pulleys carried by the skip. Y

AFor anuiiderstanding of the general construction and method ofy operating loading skips of the type'y of thepresent invention, reference may be had to United States Letters Patent of'Lichtenberg No.'1,103,788, issued July 14, `1914, and to Koehring No.

1,107,171,1ssued August 11th1914.. iu View of the prior art above referred to, specific references to and description ofthe power said prior drum 2 about which is adapted to `wind aV l cable 3 which leads to a drum operable by the motor. Also carried by are the fixed cone-shaped drums 6 disposed nearopposite ends of the shaft, and about each drum is adapted to wind a cable 7 fixed to the smaller end of the drum so as to wind toward the upper end. The two cables 7 pass over pulleys 8 on the frame B, thence downward about pulleys 9 which are sup-y ported in brackets 10 Xed to opposite sides of the loading skip 11. The skip 11 is piv- 10o n the shaft 1 otally mounted on the frame B as shown atA ent points in the length ofthe cable Vowing to the obvious adjustabilityof said clamp. The brackets 10 are of somewhat peculiar Vform in that they are provided with rear YWardly and upwardly curving extensions 16 forming abutments to cooperate with the stops 14;. y

` rl`hc pulleys 9 are of peculiar form, each pulley being formed with a centralV circumferential cable groove 9 from whichrgr'oove Vlead off series of oppositely extending snatch grooves 9, thus constituting each of said pulleys 9 a snatch or clutch. pulley.

rThe appliancesforming parts of the operating connections intermediate the motor i5, and the loader or skip 11 Aare simple ones,

Athe mechanical actioniof' which is very largelyy evident with knowledge of their construction. lt may be noted,` however, that when the drum 2 is operated by itscable 3 to thereby rotate the shaft 1, winding of the cables 7 upon the pulleysk 6 takes place. The kcables 7, furthermore, y operate Vabout the f sulle is 9 aifordino' a maximumof aower with slow movement during the initial rais ing of theskip 11 at which time, owing to the point of pivotal support of the skip, the load is largely dead weight, making necessary thel application of sufhcient power to overcome the gravitative Vforce of both the I skip and the load'. As the skip 11, however,

reaches an approximately medial point in 'its movement, the stops 141 on the cables 7 abut with theV abutments 16 and Vthereafter the. movement of the cablesl 7l is directly communicated to the skip as distinguished from the indirect communication incident to the pulley transmission devices 9 which were operative previous to the time of cooperation'of the parts 14 and 16. The ef` fective pull of the cable, therefore, vis initially sustained by the points of connection 13 and subsequently by the stops 14 in an obvious manner, the portions of the cables 7 betweenthe parts 13 and 14; becoming slack when the stops 1e sustain the load, as shown in dotted lines in Fig. 1.

lnthe event of breakage of the cable 7 at either sideof the pulleys 9 the sudden slack created incident' to the breakage causes a side lash'of the ends of the cables so as to make effective the snatch or ,clutch pulley 9 which will thus grip the cable and prevent accidental dropping of the load ofthe skip 11 and its contents, or the skip itself. rlhe pulleys. 9 are therefore safety devices and areuseful when and out of use, preventing vdropping of the skip through cable breakage, as an incident to which accidentalinjuries to workmen are caused from time to time in the operation of loading'devices of this type.

It is notable that' as theskip 11 is elevated fromvitslowermost receiving position thencone drumsor pulleys G act with gradually increasing speedl toeffect the raising movement, due to the peculiar formation of said parts. n

Having thusrdescribed my invention', what I claim as new is: p f

1. 1n combination, `a support, a loading skip movably connected at one end therewith, raising means for said skip comprising a cable anchored; at one end and passing around he pulley, means on the support for actuating the said cable, said pulley being formed with clutch grooves adapted to act automatically on breakage of the cable to prevent dropping of the skip.

2. 1n combination, a support,a skip'piiL oted at one end` thereto, a pulley attached to said skipvand` formed with clutch grooves extending in opposite directions from* its Ycentral circumferential portion, a hoisting cable anchored at one end to said support, and thence passing downwardly over said pulley and upwardly to the support, winding means on the support about which said cable may pass, said arrangement of the cable providing spaced bights extending from opposite sides of the pulley as and/for the purpose described, f

ntestimony whereof 1 affix my signature.

ERCH H. LCHTENBERGL the skip 11 is upraised 

